221101

Properties

Appears in sequences

• Concatenation of n in base 2 up to base 10 and n in base 10 down to base 2 is prime, all numbers are interpreted as decimals.at n=29A054258
• Primes for which the seven closest primes are smaller.at n=21A075043
• Primes for which the eight closest primes are smaller.at n=5A075050
• Let p = n-th prime, then a(n) = smallest prime having p as its least prime primitive root.at n=19A084739
• prime(k) for those k where floor((2*(prime(k+1)-prime(k))*PrimePi(k) mod (8*k))/k) = m with m = 13.at n=28A109567
• Records in A084739.at n=10A133434
• Primes p such that q-p = 58, where q is the next prime after p.at n=8A204668
• Smallest odd prime factor of 3^n - 1.at n=64A235366
• Smallest number requiring n steps to reach a prime under the "add a digit" process described in A241180.at n=12A241182
• Centered 11-gonal (or hendecagonal) primes.at n=30A262344
• Prime numbersat n=19706